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Finding the Fourth Proportional to 258,279.48, 387,441.54 and 71,290.98

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Solution

The fourth proportional to 258,279.48, 387,441.54 and 71,290.98 is: 106,942.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,279.48 : 387,441.54 = 71,290.98 : x
  2. Step 2: Convert to fraction form
    258,279.48/387,441.54 = 71,290.98/x
  3. Step 3: Cross multiply
    258,279.48x = 387,441.54 × 71,290.98
  4. Step 4: Simplify right side
    258,279.48x = 27,621,087,079.31
  5. Step 5: Solve for x
    x = 27,621,087,079.31/258,279.48
  6. Step 6: Final answer
    x = 106,942.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.